Stuffing-box for valves



(No'Model.)

R. T. CRANE.

STUPFING BOX POR VALVES. No. 411,425. Patented SeptQZLl, 1889.A

UNITED STATES PATENT OEEIcE.

RICHARD T. CRANE, OF CHICAGO, ILLINOIS'.

STU FFING-BOX FOR VALVES.

SPECIFICATION forming part of Letters Patent No. 411,425, datedSeptember 24, 1889.

Application tiled November 19, 1888. Serial No. 291,24=4 (No model.)

To a/ZZ whom it may concern.:

Be it known that I, RICHARD T. CRANE, a citizen of the Unitedy States,and residing at Chicago, in the county of Cook and State of Illinois,have invented a certain new and useful Improvement in Stufling-Boxes forValves, which is fully set forth in the following speciication,reference being had to the accompanying drawings, in which- Figure l isan elevation of a construction embodying lny invention, and Fig. 2 asectional view of the same taken on the line x no of Fig. 1.

Like letters refer to like parts in both figures of the drawings.

My invention relates to stuffing-boxes for valves, and has for itsobject to provide a construction whereby the gland may be more firmlyheld in place and at the same time prevented from being lost; and tothese ends my invention consists in certain novel features, which I willnow proceed to describe, and will then particularly point out in theclaim.

In the drawings, A represents the body of the stuffing-box, which isprovided at its upper end with a recess or chamber A to receive thepacking, and which has a longitudinal passage a throughout its length toreceive the Valvestem. At its upper end the stuffing box is threadedexternally, as shown at a', to receive the cap B, which is in thepresent instance constructed in the form of a nut threaded internally toscrew upon the upper end of the stuiiing-box. The cap B is centrallyapertured at its top for the purpose of having the gland connectedthereto.

C represents the gland, which tits within the recess A and is aperturedcentrally at c for the passage of the valve-stem, its lower face beingbeveled, as shown, in order to compress the packing around thevalve-stem, as is usual in constructions of this class. The gland C isconnected to the cap B by a swiveled connection, so that the said capand gland are free to rotate independently of each other, while at thesaine time the gland is carried downward or upward by the cap as it isscrewed down or up. This connection is preferably made by extending thegland upward through the aperture in the iop of the cap and thenspinning the projecting ends down over the top of the cap, as shown Theportion of the gland which eX- at c.

tends through the aperture in the cap is reduced, thereby forming ashoulder, which bears upon the under side of the top of the cap andprevents upward displacement of the gland, and the gland is preferablyfurther held in position by means of a collar o2, which bears upon theunder side of the top of the cap.

Vhen the parts are assembled and the cap is being screwed into place, itis obvious that the gland as it bears upon the packing will be pressedupon the same without rotating, and thereby tending to displace thepacking and carry it around in the box. Moreover, since the gland isswiveled to the cap it will not become loose in the box, and may beapplied and removed along with the cap with great facility. Instuffing-boxes of this class as heretofore constructed where the glandyis made separate from the cap it is difficult to remove and replace, andwhere it is made in one piece with the cap or rigidly attached theretoit is obvious that it tends to displace the packing while being screweddown thereon. These disadvantages are overcome by the construction whichI have devised, in which the gland is swiveled to the cap, so as to movetherewith and at the same time allow the cap to rotate independently.

It is obvious that various modifications in the details of constructionmay be made without departing from the principle of my invention, and Itherefore do not wish to be understood as limiting myself strictly tothe precise details hereinbefore described, and shown in the drawings.

Having thus described my invention, what I claim as new, and desire tosecure by Let ters Patent, isM

In a stuffing-box, the combination, with the body A, having recess A andthreaded eX- ternally at a', of the cap B,internally threaded to screwthereon and centrally .apertured at the top, and the gland C, having ashoulder to rest against the under side of the cap, and having a portionextended through the aperture in the cap and spun upon the top thereofto form a swiveled connection between the gland and cap, substantiallyas and for the purposes specified.

RICHARD T. CRANE.

Witnesses:

CARRIE FEIGEL, IRVINE MILLER.

IOO

